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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - Run logs retain execution output for operators. > - Object storage uses bounded admission and asynchronous uploads. > - A diagnostic can wait for capacity when its native execution ends. > - Finalization closed the writer before that existing admission could finish. > - This pull request joins those admissions before it closes the log. > - The benefit is complete accepted output with the existing storage bounds. ## Linked Issues or Issue Description Refs #18944 and #18327. **What happened?** A runner close diagnostic began object-log admission before its recorder retired. The call waited at the 8 MiB pending-byte bound. Completion then closed the writer. The waiting call failed with `Object run log writer is closed`. A valid final log hash covered the stored prefix, but the diagnostic was absent. **Expected behavior** Finalization must retain calls that started before closure. It must reject new calls after closure. Cancellation and storage failures must still settle without a success claim. **Steps to reproduce** 1. Use the actual recorder and segmented object store with a controlled conditional upload. 2. Fill the pending-byte bound. Start native warm-session retirement while the diagnostic waits for capacity. 3. Complete the run through the real completion handler. Release the upload. 4. Check the diagnostic bytes, final hash, source coverage, and warning rows. ## What Changed - Track active admission promises in each object-log writer. - Reject new producers when finalization starts. Join existing bounded admissions, then flush their tail before manifest closure. - Add actual completion coverage and store controls for failure, Stop, global capacity, and independent writers. - Clarify the finalization contract in the storage documentation. Keep feature maps unchanged for this routine fix. ## Verification - Before the fix, the actual completion probe lost a pre-retirement close diagnostic and emitted `object_log_persistence_failed`. Useful canonical output, source coverage, and the final prefix hash remained valid. - After the fix, the exact probe retains the diagnostic and checks the stored bytes and full hash. Ordinary completion and stalled local append controls also pass. - Focused store controls pass, including shared 64 MiB capacity, new-producer rejection, storage failure, Stop, and independent writer progress. - Production and test source at `bc03f8d53a721f01f80a12105a69d8583865e651`: 3 actual completion controls and 53 store, recorder, journal, and diagnostic tests pass. Run with `node node_modules/vitest/vitest.mjs run` from `server/`; select the four safety files plus the completion file with `-t "retired recorder"` in a separate invocation. - Initial treatment repository typechecks and build pass. Current map and module checks pass. A broader four-suite run had 99 passing assertions but failed its existing 30-second completion teardown hook. A later isolated completion run passed all 61 cases at the same limits. The original teardown cause remains unresolved; no timeout was changed. - Repository typechecks and build pass at that source commit. Current head `6652adc7f3379ae250f7b726dad6c58c8482410f` removes only the incidental map paragraph; production and test source are identical. All current-head checks are terminal: 54 successful check runs, one successful legacy status, and three skipped checks. Required `ci / verify` and `ci / e2e` pass. Greptile reviewed exact current head at 5/5. Both review threads are resolved. GitHub reports the PR clean and mergeable. Full repository tests stopped in chat shard 2: a GitHub recovery fair-batch test expected no provider requests but observed `GET /app/hook/config`. Its exact unchanged case passes in isolation. The original cause remains unresolved; this full-suite run is red. First-head remote server lane 2 failed a native-reassessment backlog test: its quiet check observed two active work items instead of zero. The exact unchanged case passes locally. That original CI cause remains unresolved; no job retry or timeout change was made. Other first-head CI lanes passed. The first native review rated the earlier source head 4/5 for the same removed map note. That is not a current-head assessment. Current GitHub rules require zero approving reviews and only the two CI checks above; a fresh native advisory re-review is optional and remains unavailable while its earlier run has an unresolved workspace/accounting obligation. That obligation is tracked separately and is not claimed recovered. - Removed the incidental map paragraph identified by Greptile and the native review. The follow-up contains no runtime or test changes. - This proves the local production-path mechanism. It does not attribute any specific hosted warning to this cause. Hosted replay and served revision checks remain separate acceptance work. ## Risks Finalization now waits for existing bounded capacity admissions. Storage cancellation and the existing operation deadlines still apply. Tests check that failed uploads and Stop settle, and that a separate writer can make progress. No capacity limit, timeout, or execution authority changes. ## Model Used OpenAI `gpt-6.1-sol`, through Codex, with reasoning and tool execution. Context window size is not exposed by the host. ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used (with version and capability details) - [x] I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work - [x] I have searched GitHub for duplicate or related PRs and linked them above - [x] I have either (a) linked existing issues with `Fixes: #` / `Closes #` / `Refs #` OR (b) described the issue in-PR following the relevant issue template - [x] I have not referenced internal/instance-local Paperclip issues or links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip` URLs) - [x] My branch name describes the change (e.g. `docs/...`, `fix/...`) and contains no internal Paperclip ticket id or instance-derived details - [x] I have run tests locally and they pass (56 focused checks; the full-suite red remains documented above) - [x] I have added or updated tests where applicable - [x] I have updated relevant documentation to reflect my changes - [x] I have considered and documented any risks above - [x] All Paperclip CI gates are green - [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups - [x] I will address all Greptile and reviewer comments before requesting merge --------- Co-authored-by: Paperclip <noreply@paperclip.ing>